<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <style type="text/css">
        /* 将页面中所有的标签都选中并设置样式 */
        *{
			color:red;
			font-size:20px;
        }
        </style>
    </head>
    <body>
    	<p>p1</p>
    	<div>p2</div>
    	<span>p3</span>
    	<p>p4</p>
    </body>
</html>